Relation between genu and genomos

oes the Latin word genu have somehow relation with the other Latin word genomos (New Latin gnomus) giving the fact that the gnomes are short and their growth is about the knee of a normal person and by analogy with the German Knie 'knee' -> Knabe 'young boy'?

Greek gnomon is a carpenter's square, i.e. a right angle. Right means straight up, square, correct, the strong arm, a legal privilege. The common meaning to all those things is strength. You have a right to life, but only if you are strong enough to cling to it. You have a right to the space you occupy, but only if you are strong enough to defend it. You have a right to own property, but only if you can guard it from all attackers. You may obtain the services of a champion to defend your rights, or create a government for that purpose, but of course the champion's loyalty might become a concern, and governments always eventually renege on the contract.

There is no relation to a knee. Latin genu is a separate word with it's own declensions. Genomos is descended from genomus, related to gnoma, knowledge.